Mass Effect: Pro-G Hands-on

Back at the Leipzig Games Convention, Mass Effect wasn't absolutely convincing. It certainly looked vast, and was undeniably crammed full of an enormous amount of planet-hopping adventure, but some of the claims about the open nature of its structure and plot raised a few eyebrows amongst the gathered press. Could it really be that the game's much-hyped conversation system could actually let you make huge changes to the direction of the storyline, and with it the entire substance of the game?